The Lexus is250 has two oil quantity possibility's. One is 6.6 quarts of oil , one is 6.8 quarts of oil.
5
6.8 quarts
6 liters
This car does not come with a regular filter, underneath the car you will see a round metal cover unscrew it and replace the inside, that is your oil filter.
5 quart
8.6 liters
There is 6.1 liters of oil required during oil change with new oil filter.
7 quarts
7 qts of 5w30.
Lexus uses Toyota oil filters for their vehicles, so yes, you can use Toyota oil filters for your Lexus.
5.1 Qts. with the filter